Chrome Portable Local File homepage

Hi guys,

Is there any way to set the portable chrome homepage to an internal file on the usb drive?

the file I want to use is located at

%USBDRIVE%/WebFiles/index.html

and I need the homepage link to update with each drive letter change in windows for each machine so the path cant read "file://D:/Webfiles/index.html" etc. Is this at all possible to do?

Thankyou